Treek is a chatter box. I think she has more random battle comments than any other companion. She certainly has more to say when she has nothing to say than any other companion. She has 15 different lines (that I've found so far) if you click on her when she doesn't want to talk.

She speaks in Ewok so you have to read her dialogue.

"If this war takes me to the stars endless, it is always worth fighting."- Tweek

Pysco on the Republic side got Treek as well. On the republic side she has differnt lines:

Today's updated gave all subscribers a free mini pet, JA-3 Subversive Battle Droid and a free speedster, JA-3 Speeder. However, the JA-3 Speeder requires a level 3 license so its not useable by lower level characters. It actually looks like they mixed pieces from a couple other speedsters to make this one.

They also have a different mini pet for sale, Infected Womp Weasel, apparently for Halloween as it goes away November 5th. If you want the IWM you only have to buy it once for 120 cartel coins than you can unlock it on all other characters for 60. Each character than has to go into Collections to claim it.

Nashebo has maxed affection (went broke doing it) and got all companions to 1000 kills each. So all my original Republic characters have all companions at max affection. Rojavon the smuggler still has to get some to 1000 kills.

Empire side still working on both.

Both sides need to max affection on HK51 (Arachnathena and Rojavon) and Treek. All ready reached 1000 kills on Treek. Hk51 only has 351.

My second time through characters don't need to worry about 1000 kills now but maxing affection still helps their characters to fight/heal/gather/craft better.